UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGEACT OF 1934

For the month of June 2025

Commission File Number: 001-39240

GFL EnvironmentalInc.

(Translation of registrant’s name intoEnglish)

100 New Park Place, Suite 500

Vaughan, Ontario,Canada L4K 0H9

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annualreports under cover of Form 20-F or Form 40-F.

¨     Form 20-F

x     Form 40-F

EXHIBIT INDEX

The following Exhibit 99.1 is furnished as part of this CurrentReport on Form 6-K.

Exhibit Number		Description

99.1		Press Release, dated June 25, 2025

SIGNATURE

Pursuant to the requirementsof the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereuntoduly authorized.

	GFL Environmental Inc.

Date: June 25, 2025	By:	/s/ Mindy Gilbert
		Name: Mindy Gilbert
		Title: Executive Vice President and Chief Legal Officer

Exhibit 99.1

GFL Environmental Inc. Sets Date for Q2 2025 Earnings Release

VAUGHAN, ON, June 25, 2025 – GFL EnvironmentalInc. (NYSE: GFL) (TSX: GFL) (“GFL” or the “Company”) today announced that it will release its 2025 second quarterfinancial results after the market closes on Wednesday July 30, 2025 and will host an investor conference call related to this releaseon Thursday July 31, 2025 at 8:30 am Eastern Time.

A live audio webcast of the conference call canbe accessed by logging onto the Company's Investors page at investors.gflenv.com or by clicking here or listeners may access thecall toll-free by dialing 1-833-950-0062 in Canada or 1-833-470-1428 in the United States (access code: 117324) approximately 15 minutesprior to the scheduled start time.

The Company encourages participants who willbe dialing in to pre-register for the conference call using the following link: https://www.netroadshow.com/events/login?show=3250489d&confId=84171.Callers who pre-register will be given a conference access code and PIN to gain immediate access to the call and bypass the live operatoron the day of the call.

About GFL

GFL, headquartered in Vaughan, Ontario, is thefourth largest diversified environmental services company in North America, providing a comprehensive line of solid waste management servicesthrough its platform of facilities throughout Canada and in 18 U.S. states. Across its organization, GFL has a workforce of more than15,000 employees.

For more information:

Patrick Dovigi

+1 905-326-0101

pdovigi@gflenv.com